Wiktionary
autumn equinoxes
n. (autumn equinox English)
Usage examples of "autumn equinoxes".
They represent the equinoctial and solstitial colures, binding together the four constellations in which the sun continues to rise at the spring and autumn equinoxes and at the winter and summer solstices for epochs of just under 2200 years.
At the spring and autumn equinoxes, when day and night are equal, day and night hours will be of the same length.
The first and the last of these so-called 'Goblin Fairs' marked, respectively, the spring and autumn equinoxes.